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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b06d081b160f4076b9dc0d9af400ab7f38444ffb214a8934c9b76c033678b5b3' 
  AND token = 'a/alcuB7Z68ejJ66hNek5o5pDNAwGc7Vuj4l9okAN50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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