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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70ee97d5390d07b1d408893ff557fdd90aee0ee8964d2b711198d0194be34768' 
  AND token = 'qJ8Gdf9lZzJgLpuriHyjA0477a98L7TcQskwaTeknR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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