SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de561b57c35ebf14cd1e5cba53cf8fd8f75cc939a039e1c29ca13022bd760086' 
  AND token = 'eXOYuCpBb7cYKggavJH4AIkEZwWwN+n73Zqm8fFYuKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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