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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce998e5f637ff822d12111a4665229fd672682a4e7c5b62798a0956b7b7cb548' 
  AND token = 'Xh7kvs18llvxELDPV6BmL06RkG3inpcT19gBSxpQaHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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