SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bedf2fc2d1ba8aba8089f5055492b286c0ef9436a8f13f67704607ee551f7d28' 
  AND token = 'w20qEjcnGKYNMCyBRC1eXt/FlzCP/4j5ywXHm370d1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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