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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6e3754288148e29585003eea73f02d97ed5d206abdccd8c597a018cba9946dc' 
  AND token = 'rdLTu+ODBscQTmRxka2BQCps1UnbP7P8WGsDAIkWkY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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