SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd213553b340fa6285772ba59c6c1de20fee42c54e7b421909d89b45c6416de6d' 
  AND token = 'vo3ngpcxXm2FGPIJopYKDzv/C0JMb5VWboFX+ZwMizg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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