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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7336e20cb2f0764c35ffb43f42e519b8a3a4b52ee3c856013acc722eca7cdedb' 
  AND token = 'uIiqlcdzNckdR+8jovqAcXGHMcO9QLf1csliHu++gKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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