SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e87404d061a0363c446cde4afda153dab89d57f24d9813b8a316ddd639dfd0fb' 
  AND token = 'P4YE7+fATuOToRGDCzxuawCSrmmqj6QhpBVytw/E22Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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