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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '254d8849228086d1b7a47369734094830c0d95afaa953853d39cb918cca71dc3' 
  AND token = '62YT3D0reGk9lg+qX2UOJeuPzUEp7cXWH5IWd+jNTTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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