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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '650277b34d15317fa50423e0ee3b6cdc35bb0f14ea843859b86c9ef1aee31364' 
  AND token = '7RPqh4xayZgJ9Q66Qy5OY//lnQWpZKByK2am3SVp6H8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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