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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86cfe96d1841761739112c76b9fb58aade43757565626bceb010b5e446da3d90' 
  AND token = '4bWdP1ELQg6Acwyvs/hm6Bo8LuGE9DXingvwJh6umhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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