SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58312056776fd8b5a9db55b8d309a55b756c133e0638f59b6e5f454d33f1daaf' 
  AND token = 'C+ZnYiXUTCTC3MX2th6ywApIj3LSgF2nvq24WFOzIqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00095

JSON explain

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