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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9597acf482874f635e944f7cf8b5e656238c2d01f5eade51eca694b3f32d70cd' 
  AND token = 'dOusEvwH0jAfil5Zn+QUalHwSDJWJjiS20zOjC9d5w8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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