SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf4754fbd9fda8fdaba6f517f3853509df1b8c057cb135c2bed5963263ba4d3e' 
  AND token = 'hxJaB4uP8rPeSRugcQijlVS2iOXPHvEdqFF+Bmftl14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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