Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48959368313d56e087e6235bb92dee62a532128b9e60d110b97e193271ef623a' 
  AND token = 'HytzxsY8WRUhgQiLZqcctQhAWRcjQt1F4gEm5CgsKzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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