SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eeccdc653234bd1990e2dc70a026d7faff6e3f6ae74a09bd6c8bc336c82f79f' 
  AND token = 'vsQjQ/XqDmlHbLlGmqpdZiFaYo4ZGtRwPrNPIF5ZlBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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