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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40c4c712e43a32c15a8305485fd63cc338b6b7fb0f5828676a460be282d42005' 
  AND token = '6lUVDfskWsGsNAQ4ys1cb08p3cahDV6hjEJ38utHc9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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