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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94d1fd582b56426df51e5c578e94d97ec27bf57be01966b127fc16b5adc596f7' 
  AND token = 'kQCnvQuvkRiJO4ZoS94sIWwRAFyNgNJ9TKzVtw5UC04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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