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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf3c399b5feb9f43b1d1d85b7dd8bcb26726eac3daac9689b8e7c7f92343db7e' 
  AND token = 'bvsHPLLYOO7dgWaVgEvTaWHXKgDg0GI9ljWfdh9E6qw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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