SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '236fd0c0621d14763963cf472a5aab9140f89ebf6fdf380cc9a63a3f3d82a7b8' 
  AND token = 'Fo2G7YjHfL+ZzDPyzrCC+zzkdchr1oNQvJfQSwMvnxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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