SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b1e9d549802b93e285d35a4053d98f854ff6d79640ff1937bb41a38ff006123' 
  AND token = 'v+nwlJpnZHfyuYJXOZKMuPNBwMVwieQjUs6iCC2wuME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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