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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af59b034f29452bb6755ca3e9b48dfbccf4f08d8d359a424016ab789cbfbfa79' 
  AND token = 'oiYt0OvqN5+CV+5LNrM+WfLSBGgMvcJuoCoF/FdNx+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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