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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d26fe7e553b263ce439679b1de9cb37b13c910914b13651f6a60c07d1c1507a' 
  AND token = 'JEsfFJG+YMcrY6ipg4JCqpAxKcX6Yjw2ASnLU7EylaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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