SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0e5f334a536a476133b34e32d2f02dded212b2456274efb8e3443b187bc75d7' 
  AND token = 'qWHpD79VB2Chnv50jAd1hO4wnsj9AC4QLYpMFz2ZuCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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