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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adcce91e53d17b0e8cb2b0d8b96bf53df01bb6e7c9db205f487bc156e360e414' 
  AND token = 'NeqshxCoWrX5YqhFttOCkmotFPe6TjFq8Fw5zZH7fJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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