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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcdf55872b6bdfcdaa02a5941bce6622ae9734d8da1acc4f2b2fcc5e9f601752' 
  AND token = 'IqLu1s0zxeOkgf/6iSekW1eWqNdOn5hZ1BKJiR5G6dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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