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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38cd72a231d45d33aeb76f3be7bb773fa3a08aca01cd858595b8a98d6e71f1c2' 
  AND token = '5hFgT35+2zEdJXjMnd0bTvPrFAbyl5g9Kd33Rqrcqcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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