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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9db99c21e7eb2c461a68af7ac84737df2d31ed9adb0a2bdc3120f3ba5677f07' 
  AND token = 'yAr0Davm62p0s16y12FAqZcdpbJSumUjBAPvKewa+RQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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