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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8584da669dbbe22dff8ae24a6cdaab09ccc9dac9918a3273ce12ae36f64a08cd' 
  AND token = 'rmNGSST7mBinJaRq/o7xsEevKFhW/CDEaKCnJY0Mw0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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