SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff94b8d38ddf952db113f6692699ea5436c57cc94b86f0967bdbbf17eb8c271f' 
  AND token = 'v8kaoXn2ZCL8KC2DGRBUPyQ5tS4ZleX+JuAVs1tqI7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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