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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cc29d7f15cf078f32a6e5a920277d33344d6b86d5f25623f37daf85628fa1fd' 
  AND token = '55kGrlDWbhfNh9lIpNh9jf2V2hMrnxT/iogqiuLW5jM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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