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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13ac62c76654ea5119aa307c7482f76a3f36bb006955b1a9217d5d26dfe2f705' 
  AND token = 'KhOWxf0WlmDIlzzDlTE4AUeVpM+afsiBOEn9DfOQRsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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