SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62c8b5718f1747f0386dab580a5d7696928f275c833a6f2199b6202ff3cf72e1' 
  AND token = 'Wtq+XvylxOOc4wGHwp3kY/3gSkmrxbCu9Is4z+ixS64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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