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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92949f1e30c971b6c3a1641948a7d9f49ccf8f08cfb1cce5d5709b6dacd86e8d' 
  AND token = 'sQ9GJhCpnDoALyj3DDcchc7R0UN1yHY3eQBgiLFs9A0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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