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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '068dfc45050ed13e1839c50a985a42b08e2e79a48504bc219cdc0c4b8d7bcca8' 
  AND token = 'PUd++de/L10Rs95L1FR6+RcZMdF9ooOrZT7ApVIS45U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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