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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '893688d3b5258b84b5ccf540a3acf02bb96646c386cab5368f7d8ac900b9ce98' 
  AND token = 'RB3yiXiOBgk/rx11CeaAo/M6S0SpUt0nhbM7rAe+o4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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