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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dcc98fa89df5b9da8796388f77f4782acdbfa13a9d40a24b1412f682e6b404b' 
  AND token = 'tKkszqim6zpi7RYUc6NioQpqkPlQLWl7ZgIOLXL+I18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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