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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73fc1d8da713b182efb36e325053dec986f78e9aac0d7bba002b7f43b0f50e6f' 
  AND token = 'bFNDVRhtYhEUZdWYAvK0EvSpd4IpTXeZZCdujCHsrEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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