Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c23c4eef6e93fe31fc56b689659b1db38660df1caa6d0dbc4b0e1b97db00c8ef' 
  AND token = 'zH0yuA1DGLlQCl585yva4nhtiI5wQO+hWd3vYkPFKr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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