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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98a818da467df482ca93cdac43cbb4c8ae988f5e48c1e9f2f9671ae6e1dbbbe2' 
  AND token = 'oxjrwKSo6RIMCgy9Yvt9XYCKS0TXrOw/5gnLo2Y4PUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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