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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f299a76a2cea353c953ce026c5ab4124adb34b1aad81d28ee418b5769427f48f' 
  AND token = '/MTj7ZDb6XsYgDjjWWp52sSpurrv8kQNl1WCSqGy1FQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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