SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bee8760f4aa89cff4071507988920b79356c49d1535cbc1bc17b8ac0fc513ee7' 
  AND token = 'hp9g7ZAUDz3pDThUU1pI0xSba8J8/Zwq2vp4CKwQBqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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