Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c84df7f02384e5e4e12f110726f8e7bac59da73c4f97df42fa675b25dff14d4c' 
  AND token = 'd+sxUt+dlVUv9nFR3C6H8U7zTOHAJJnRqXf5OsSpN0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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