SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d08ada240d43ede8e199ca024817833db45625b2eacca6bb84f28ff1445428c' 
  AND token = 'YK/kTJYh4Vq3sPWt6gxwGo2JlNqBs6ZR3g6HwqViX0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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