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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61981bcf1604f703dcf5b419fd3d2ad6f470e0fa4e8f78419e505ec3bcc3d95d' 
  AND token = '4rOwGG34e/RAcyMt9/pnai2IB2gtm25Zu/uzaml2PaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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