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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0452e22281d3bd4ee1e48a9e549db6fc1a2a2b51bbb2fd3734dd20c0dddaedaf' 
  AND token = '/7R8dxmZ4TkD8VqMU/3ddY6H2FOXFSW1BjJs8OkbEY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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