SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '096ec0a5ba7da54a7e752a2225d12a34465751b642c7680b2aef2ea20ec33505' 
  AND token = '9BwKZL8G3iyIiSoUwutwDKqQkzFhy1RpQVFCg31TOhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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