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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bb21cf30a19bba21d67d45b6a5d9b75bd67ee72b12b658ed325681a95204ccf' 
  AND token = 'BL7yKydho3VUR7Umx053hexOo1wIofKWgtGoKon4/io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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