SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd00a25148ccb24087a5882f1211797be29d91d39530f74aa6b2b5f14f13df989' 
  AND token = 'Mo/Kc+CgQSsFXsvazoAFAd9DSdD+Y0TTPRFhuJNHp3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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