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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9797ccc6efb4528253322d02f37f1a9a6f8c81eca67f52c5bdc8a84eb69c58c0' 
  AND token = 'je4e8RWuL36nV5bgw1VN/xGtXc4rWK6vwXJnljctU6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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