SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9325032930240bb87dc251d8ff3471c528281825f27dc7ab6f84b064a1d88033' 
  AND token = 'tzNmIvJN4PmrshEaBJwEHLXJczY4vho3ryrFGxL7ZjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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