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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cc862c1ab14d67f6a11ddb6398f2a2ab327f69c26476a253e870d04ca069aab' 
  AND token = 'HrU0PCLLCgyFd1eqeUiXId8YYWZf+nEB9up1MyKLEJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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