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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ea4f7ed2fb5358ca5590b9de88efcb3d42d259e627f22ae114a1928bbfba5f1' 
  AND token = '/9eHQyR+j2UspFnHiTZ/7luu9teg2HUIQjF9ZTgIIj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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