Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c2a70fcb260181910b340b54824893a45bbce2462beb4dc5a56da1bfbfac8ad' 
  AND token = 'kiWKdNGxB+NLyI3r+WigOu+TzspX8KKVIShaj3cH6NU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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