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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbee32891d5b51b6dc6e4e0ddf907d5738f7760fedf7885d3c24c00f77ed2d5a' 
  AND token = '1zS00cxRYyXBCipEHSFRku4vmCbELOfD+UfyQ/N7YoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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