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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0055cc170577e6e0c688edac3f7cef0ba55137a657e94f2685a031d815c29380' 
  AND token = 'sRt3JvR96pEOEhFYzhQcRSmrr3Vx5PxDP+YJhHTj0cU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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