SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a19df621a44259f5c3104e58e7190fe7f23ae72c4f095b2b3f95b78a3d2c004' 
  AND token = 'ZyhgjvcATWm4IhijIGRzHqOtXK8kLaXCPLfUW6dSVT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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