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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d2bccc5d9bd6def36356a5afc286fb9d2e46817705e94c728fd2c98a73dc54d' 
  AND token = 'DArTizjD09Is8rMvvf+J1d94028lSTB2SndUXeusJD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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