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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91c9857da05e8ca9d9b94d6fedaf9c37d3704b8c2ccadfe1313bfa5c4d9e0229' 
  AND token = 'SkFMLpZBV8krpyKQyKCO3WY3ZYeB7ipkxeffbJ1BcWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}