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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f08f1fd36513c76949527c7e660b941d9ec27d807929625d460b6fe56825ad26' 
  AND token = 'TF7OMlN5gfW+7Zt1OlXlyUwZhL7Ln8t1SUlScWyRM1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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