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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bacdaafcb144c23f090d6a3a45bab9e2335b75775218409fae0f330c543fa90b' 
  AND token = 'AaAbSBX6pSQZht72WId8+v+yz2IHCoPCqmOzRVTVo2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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