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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11f1a74a4ea3ac2f9a3c5f02b169774c504569183cd77ac15f8a9ba708d4e38c' 
  AND token = 'ZiF3afFa/VpaBIYMABtuhxc5hAckmgbRmLRVWQ9vc5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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