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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99e08329f9f8a8c255a07e86b8204227a86d7252436e736cddcdefdbcbab9d98' 
  AND token = 'qvVRr2qkQJw592V5ntnZGa1+FNPH1/uSWvMFw36/JNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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