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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d3f1b4fa016da3cbda03900d1094e640e7603edbbb12411220b898a9a98437c' 
  AND token = 'hDju/LV6Rgsvy0QXO00v4810aITOKv64k3WcgpZDT9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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