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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d0006e766310e5bec13f190d8e8311910c37846119bd5b127a1ce450762eb1b' 
  AND token = 'zZuLwF9Q+WfIkJr5Aa+jc0ezofRzxT1R75MdyACM2EE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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