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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a42e43c079352162f3077e85002c3431de0e4ee4bae23f39554214719219515' 
  AND token = 'SyHtBlQw368SAVqWECCyb4AuVmIkcu6F/gDx1CiHoTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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