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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ae58ff5e0b23fa249d330d42adeb7092cdc63602a1b7f313b6d9aac57b4eefa' 
  AND token = '3ZQR6HQdJ0bkXK7iqa3ehBbf5bDRliNaTDGzghEc5wU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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