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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af0899289dbc6ef6d843a0be9d3d1465e9d886ed50b9c710b2b9cf36aa89ac1b' 
  AND token = 'CVRPz6Q+UsF0TodLe6QJevSBdZeBE5qaM+bp3//UfGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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