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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f949c62ad784621bcc0d505ec6836728a10b461c877496d018cff0f958cfcc9' 
  AND token = 'TmS/Trp65XMaTSB5fk5QM68G1Eqw43YZxGdATISt/rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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