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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23ae3ac751b9b7741af7aaf15f25b372d928a27af08e351325b3603bf0ba1199' 
  AND token = 'scrA3Yp/T0nw/vhcKMzbXjewn67ltMu1cVR/O5cPuw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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