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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a38e647a4ee79bc3340d4884b230db63ac4e0ebae40b8c91e22c0e7df1e0d7e7' 
  AND token = 'az6c48BRHtgPQkojpphFGTx8+IqJlGiAfgOjHgeRnoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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