SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22763f685f8b05814762b0a32ab24f1f1fe9070abf41f86c8775f8f92198d494' 
  AND token = 'CGlF2vQ25B6mNgA9JxPYsXhyjK99cGMVCsHCfmiiThQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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