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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a64bf59d1f01910ef64acd98fe4c712a36c53e52129bb60f8b5808f8a90c344b' 
  AND token = 'UTU5xrppiM42iZmIuHshVpBYmrm2qC+tyoLcmQtfgnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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