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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ba96a712aa878b3bca678d5424730b871fa60eb1b4dab9d288c3a4b7028e028' 
  AND token = '4IOz9oXCJT+C0D8EfvJ4eXtfjXFU106tqwv3pZ2IdkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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