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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a729df5ba5eeb8398e1055221339e79e535d96d508e50b6f45799b719ba8c83a' 
  AND token = 'Wm6QerX+311ANJa/xrZSwO1iMIeJ3DstVqMWREqqT+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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